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Old 8th October 2008, 09:09 AM   #1881
h_a is offline h_a  Europe
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Well, in principle you can use Patricks variant also with laterals as the 2SK1530 has already really low VGS.

However, don't forget that laterals have much less transconductance, which translates into lower gain and higher output impedance. You need about a pair to get the same values as a single vertical fet; in that case gate capacitances are about the same again (though more linear).

Go for it, if you want.

Have fun, Hannes
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Old 8th October 2008, 09:23 AM   #1882
jameshillj is offline jameshillj  Australia
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Thanks Hannes.
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Old 8th October 2008, 09:44 AM   #1883
h_a is offline h_a  Europe
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In principle it should work, though the bias will drift in the other direction (to lower values).

However as I can't open the schematic I cannot give you more help

Have fun, Hannes
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Old 8th October 2008, 10:24 AM   #1884
jameshillj is offline jameshillj  Australia
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I'll just give it a go and see what happens..... interesting cct. Have got excess voltage on trannie so might try some rail regs.
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Old 8th October 2008, 10:43 AM   #1885
jackinnj is offline jackinnj  United States
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The K1058/J162 lateral mosfets aren't quite as beefy as the IRFP240/9240 so you may have to pair them up.
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Old 8th October 2008, 11:15 AM   #1886
jameshillj is offline jameshillj  Australia
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Tks jack.
Pity our $ has dropped so far - might wait for it to settle down a bit.
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Old 8th October 2008, 11:45 AM   #1887
jacco vermeulen is offline jacco vermeulen  Netherlands
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Either double up or get a really big heatsink

(with an inflation level of 4.5 points and the interest rate undoubtedly dropping a lot lower than yesterday's 6% i hope you've got a very long breath, James)
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Old 8th October 2008, 02:30 PM   #1888
jameshillj is offline jameshillj  Australia
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Yeah,
It's our turn to do some $ reorganizing, I think - or have it done for us, is more like it.
I'll need a belt with less holes!!

I think the lateral fets will go back in the box, too although the "doa jfet follower" might benefit from something a little different.
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Old 8th October 2008, 02:30 PM   #1889
gaborbela is online now gaborbela  Canada
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Default Balanced version

Hello
Can someone help me to find the balanced version schematic or maybe the layout for that . I want to find the version which already built by someone and works well .
I have some Toshiba 2SK1529 /2SJ200

Thanks Cheers
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Old 8th October 2008, 02:50 PM   #1890
jackinnj is offline jackinnj  United States
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Quote:
Originally posted by jameshillj
Tks jack.
Pity our $ has dropped so far - might wait for it to settle down a bit.
The only reason they are so expensive on my webstore is that they have been difficult to find, and Newark is even more expensive and was out of stock for over 3 months.

Newark is pretty good, however. I use their MCM division for transistors all the time.
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